The paper presents the results of the research of figural infection mechanismus of Dothistroma septosphora, Cyclaneusma minus, Lophodermium seditiosum and Sphaeropsis sapinea. These fungi have shown different modes of needle penetration. The greatest number of D septospora conidia germinates after 48 hours (individual conidia start germinating already after 8 hous), by forming 1-3 germ tubes. Most frequently, 3 germ tubes are formed, two at the ends and one in the centre. Most of tehe germ tubes develop in the direktion of stomata. Appressoria-like structures are then formed in the stomata. The infection hypha starts from the centre of these appressoria-like structures and pnetrates the guard cells, then occupies the mesophyll. Eight days after inoculation, numeros secondary conidia are also formed on the surface of the needles. Within the mesophyll, the mycelium penetrates both inter and intra cells, occupying even the endoderm and resin canals. Germ tubes have never been on the inoculated needles, in the controlled conditions, occur after 6-8 months, while the first fructifications occur after 3,5-4,5 month. Ascospores of Cyclaneusma minus germinate and form 2-4 germ tubes. The germ tubes penetrate the stomata, without the previous formation of appressoria-like structures. Ascospores of Lophodermium seditiosum germinate into a short germ tube at the end of which an appressorium-like structure is formed. The germ tubes start from the centre of the appressorium and penetrate directly through the cuticle and the walls of epidermal cells. The conidia of Sphaeropsis sapinea start germinating already after one hour, and process of germination is almost fully terminated after 6 hours. The germ tubes penetrate either through the bark of young shoots or through the needles. Before needle penetration, the aggregations of hyphae are formed on the urface and then the germ tubes penetrate into the stomata. Within the stomata, the hyphae are first stored and then they penetrate through he guard cells ino the mesophyll. From there they are further distributed both inter and intra cells.
